Thread (7 messages) 7 messages, 3 authors, 2021-09-29

Re: [PATCH v2 13/13] drm/msm: Implement HDCP 1.x using the new drm HDCP helpers

From: Stephen Boyd <hidden>
Date: 2021-09-17 06:00:28
Also in: dri-devel, intel-gfx, linux-arm-msm

Quoting Sean Paul (2021-09-15 13:38:32)
quoted hunk ↗ jump to hunk
diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
index c8921e2d6480..3ae6fc7a2c01 100644
--- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
@@ -3088,7 +3088,9 @@ mdss_dp: displayport-controller@ae90000 {
                                compatible = "qcom,sc7180-dp";
                                status = "disabled";

-                               reg = <0 0x0ae90000 0 0x1400>;
+                               reg = <0 0x0ae90000 0 0x1400>,
+                                     <0 0x0aed1000 0 0x174>,
+                                     <0 0x0aee1000 0 0x2c>;
I suspect we'll still want this hunk of the patch to be split off and go
through arm-soc tree.
quoted hunk ↗ jump to hunk
                                interrupt-parent = <&mdss>;
                                interrupts = <12>;
diff --git a/drivers/gpu/drm/msm/dp/dp_debug.c b/drivers/gpu/drm/msm/dp/dp_debug.c
index 2f6247e80e9d..de16fca8782a 100644
--- a/drivers/gpu/drm/msm/dp/dp_debug.c
+++ b/drivers/gpu/drm/msm/dp/dp_debug.c
@@ -8,6 +8,7 @@
 #include <linux/debugfs.h>
 #include <drm/drm_connector.h>
 #include <drm/drm_file.h>
+#include <drm/drm_hdcp.h>

 #include "dp_parser.h"
 #include "dp_catalog.h"
@@ -15,6 +16,7 @@
 #include "dp_ctrl.h"
 #include "dp_debug.h"
 #include "dp_display.h"
+#include "dp_hdcp.h"

 #define DEBUG_NAME "msm_dp"
@@ -24,6 +26,7 @@ struct dp_debug_private {
        struct dp_usbpd *usbpd;
        struct dp_link *link;
        struct dp_panel *panel;
+       struct dp_hdcp *hdcp;
        struct drm_connector **connector;
        struct device *dev;
        struct drm_device *drm_dev;
@@ -349,6 +352,38 @@ static int dp_test_active_open(struct inode *inode,
                        inode->i_private);
 }

+static ssize_t dp_hdcp_key_write(struct file *file, const char __user *ubuf,
Is this the API that userspace is going to use to set the key? Or a
simple debug interface that's used to test this code out? I hope it's a
debugging aid and not the normal flow given that it's through debugfs.
+                                size_t len, loff_t *offp)
+{
+       char *input_buffer;
+       int ret = 0;
Please don't assign variables and then overwrite without testing the
variable.
quoted hunk ↗ jump to hunk
+       struct dp_debug_private *debug = file->private_data;
+       struct drm_device *dev;
+
+       dev = debug->drm_dev;
+
+       if (len != (DRM_HDCP_KSV_LEN + DP_HDCP_NUM_KEYS * DP_HDCP_KEY_LEN))
+               return -EINVAL;
+
+       if (!debug->hdcp)
+               return -ENOENT;
+
+       input_buffer = memdup_user_nul(ubuf, len);
+       if (IS_ERR(input_buffer))
+               return PTR_ERR(input_buffer);
+
+       ret = dp_hdcp_ingest_key(debug->hdcp, input_buffer, len);
+
+       kfree(input_buffer);
+       if (ret < 0) {
+               DRM_ERROR("Could not ingest HDCP key, ret=%d\n", ret);
+               return ret;
+       }
+
+       *offp += len;
+       return len;
+}
+
 static const struct file_operations dp_debug_fops = {
        .open = simple_open,
        .read = dp_debug_read_info,
@@ -363,6 +398,12 @@ static const struct file_operations test_active_fops = {
        .write = dp_test_active_write
 };

+static const struct file_operations dp_hdcp_key_fops = {
+       .owner = THIS_MODULE,
+       .open = simple_open,
+       .write = dp_hdcp_key_write,
+};
+
 static int dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor)
 {
        int rc = 0;
@@ -384,6 +425,10 @@ static int dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor)
                        minor->debugfs_root,
                        debug, &dp_test_type_fops);

+       debugfs_create_file("msm_dp_hdcp_key", 0222,
+                       minor->debugfs_root,
+                       debug, &dp_hdcp_key_fops);
+
        debug->root = minor->debugfs_root;

        return rc;
@@ -391,7 +436,8 @@ static int dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor)

 struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,
                struct dp_usbpd *usbpd, struct dp_link *link,
-               struct drm_connector **connector, struct drm_minor *minor)
+               struct dp_hdcp *hdcp, struct drm_connector **connector,
+               struct drm_minor *minor)
 {
        int rc = 0;
        struct dp_debug_private *debug;
@@ -413,6 +459,7 @@ struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,
        debug->usbpd = usbpd;
        debug->link = link;
        debug->panel = panel;
+       debug->hdcp = hdcp;
        debug->dev = dev;
        debug->drm_dev = minor->dev;
        debug->connector = connector;
diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
index 8b47cdabb67e..421268e47f30 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.h
+++ b/drivers/gpu/drm/msm/dp/dp_display.h
@@ -27,8 +27,13 @@ struct msm_dp {
        struct dp_audio *dp_audio;
 };

+struct drm_atomic_state;
+
 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
                hdmi_codec_plugged_cb fn, struct device *codec_dev);
+struct dp_hdcp *dp_display_connector_to_hdcp(struct drm_connector *connector);
+void dp_display_hdcp_commit(struct msm_dp *dp_display,
+                           struct drm_atomic_state *state);
 int dp_display_validate_mode(struct msm_dp *dp_display, u32 mode_pclk_khz);
 int dp_display_get_modes(struct msm_dp *dp_display,
                struct dp_display_mode *dp_mode);
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
index 764f4b81017e..8e62558b4fc3 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -5,11 +5,20 @@

 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_atomic.h>
+#include <drm/drm_connector.h>
 #include <drm/drm_crtc.h>
+#include <drm/drm_hdcp.h>

 #include "msm_drv.h"
 #include "msm_kms.h"
 #include "dp_drm.h"
+#include "dp_hdcp.h"
+
+struct dp_connector_state {
+       struct drm_connector_state base;
+       bool hdcp_transition;
+};
+#define to_dp_connector_state(x) container_of(x, struct dp_connector_state, base)

 struct dp_connector {
        struct drm_connector base;
@@ -17,6 +26,11 @@ struct dp_connector {
 };
 #define to_dp_connector(x) container_of(x, struct dp_connector, base)

+struct msm_dp *msm_dp_from_connector(struct drm_connector *connector)
+{
+       return to_dp_connector(connector)->dp_display;
+}
+
 /**
  * dp_connector_detect - callback to determine if connector is connected
  * @conn: Pointer to drm connector structure
@@ -114,20 +128,72 @@ static enum drm_mode_status dp_connector_mode_valid(
        return dp_display_validate_mode(dp_disp, mode->clock);
 }

+static int dp_connector_atomic_check(struct drm_connector *connector,
+                                    struct drm_atomic_state *state)
+{
+       struct drm_connector_state *conn_state;
+       struct dp_connector_state *dp_state;
+
+       conn_state = drm_atomic_get_new_connector_state(state, connector);
+       dp_state = to_dp_connector_state(conn_state);
+
+       dp_state->hdcp_transition = drm_hdcp_atomic_check(connector, state);
+
+       return 0;
+}
+
+static struct drm_connector_state *
+dp_connector_atomic_duplicate_state(struct drm_connector *connector)
+{
+       struct dp_connector_state *state;
+
+       state = kzalloc(sizeof(*state), GFP_KERNEL);
+       if (!state)
+               return NULL;
+
+       state->hdcp_transition = false;
+
+       __drm_atomic_helper_connector_duplicate_state(connector, &state->base);
+       return &state->base;
+}
+
 static const struct drm_connector_funcs dp_connector_funcs = {
        .detect = dp_connector_detect,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .destroy = drm_connector_cleanup,
        .reset = drm_atomic_helper_connector_reset,
-       .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+       .atomic_duplicate_state = dp_connector_atomic_duplicate_state,
        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };

 static const struct drm_connector_helper_funcs dp_connector_helper_funcs = {
        .get_modes = dp_connector_get_modes,
        .mode_valid = dp_connector_mode_valid,
+       .atomic_check = dp_connector_atomic_check,
 };

+bool dp_drm_is_connector_msm_dp(struct drm_connector *connector)
+{
+       return connector->funcs == &dp_connector_funcs;
+}
+
+void dp_drm_atomic_commit(struct drm_connector *connector,
+                         struct drm_connector_state *conn_state,
+                         struct drm_atomic_state *state)
+{
+       struct dp_connector_state *dp_state;
+       struct msm_dp *dp_disp;
+
+       dp_state = to_dp_connector_state(conn_state);
+
+       if (!dp_state->hdcp_transition)
+               return;
+
+       dp_disp = msm_dp_from_connector(connector);
+
+       dp_display_hdcp_commit(dp_disp, state);
+}
+
 /* connector initialization */
 struct drm_connector *dp_drm_connector_init(struct msm_dp *dp_display)
 {
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.h b/drivers/gpu/drm/msm/dp/dp_drm.h
index c27bfceefdf0..a5d95c6acd67 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.h
+++ b/drivers/gpu/drm/msm/dp/dp_drm.h
@@ -14,5 +14,10 @@
 #include "dp_display.h"

 struct drm_connector *dp_drm_connector_init(struct msm_dp *dp_display);
+struct msm_dp *msm_dp_from_connector(struct drm_connector *connector);
+bool dp_drm_is_connector_msm_dp(struct drm_connector *connector);
+void dp_drm_atomic_commit(struct drm_connector *connector,
+                         struct drm_connector_state *conn_state,
+                         struct drm_atomic_state *state);

 #endif /* _DP_DRM_H_ */
diff --git a/drivers/gpu/drm/msm/dp/dp_hdcp.c b/drivers/gpu/drm/msm/dp/dp_hdcp.c
new file mode 100644
index 000000000000..07d2a1f04d97
--- /dev/null
+++ b/drivers/gpu/drm/msm/dp/dp_hdcp.c
@@ -0,0 +1,433 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright (C) 2021 Google, Inc.
+ *
+ * Authors:
+ * Sean Paul <seanpaul@chromium.org>
+ */
+
+#include "dp_display.h"
+#include "dp_drm.h"
+#include "dp_hdcp.h"
+#include "dp_reg.h"
+
+#include <drm/drm_connector.h>
+#include <drm/drm_device.h>
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_hdcp.h>
+#include <drm/drm_print.h>
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/iopoll.h>
+#include <linux/mutex.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+
+/* Offsets based on hdcp_ksv mmio */
+#define DP_HDCP_KSV_AN_LSB                     0x0
+#define DP_HDCP_KSV_AN_MSB                     0x4
+#define DP_HDCP_KSV_AKSV_MSB                   0x1D8
+#define DP_HDCP_KSV_AKSV_LSB                   0x1DC
+
+/* Key offsets based on hdcp_key mmio */
+#define DP_HDCP_KEY_BASE                       0x30
+#define  DP_HDCP_KEY_MSB(x)                    (DP_HDCP_KEY_BASE + (x * 8))
+#define  DP_HDCP_KEY_LSB(x)                    (DP_HDCP_KEY_MSB(x) + 4)
+#define DP_HDCP_KEY_VALID                      0x170
+#define  DP_HDCP_SW_KEY_VALID                  BIT(0)
+
+/*
+ * dp_hdcp_key - structure which contains an HDCP key set
+ * @ksv: The key selection vector
+ * @keys: Contains 40 keys
+ */
+struct dp_hdcp_key {
+       struct drm_hdcp_ksv ksv;
+       union {
+               u32 words[2];
+               u8 bytes[DP_HDCP_KEY_LEN];
+       } keys[DP_HDCP_NUM_KEYS];
+       bool valid;
+};
+
+struct dp_hdcp {
+       struct drm_device *dev;
+       struct drm_connector *connector;
+
+       struct drm_dp_aux *aux;
+       struct dp_parser *parser;
+
+       struct drm_hdcp_helper_data *helper_data;
+
+       struct mutex key_lock;
+       struct dp_hdcp_key *key;
Is there a reason this is a pointer vs. a plain struct member?
+};
+
+static inline void dp_hdcp_write_dp(struct dp_hdcp *hdcp, u32 offset, u32 val)
+{
+       writel(val, hdcp->parser->io.dp_controller.base + offset);
+}
+
+static inline u32 dp_hdcp_read_dp(struct dp_hdcp *hdcp, u32 offset)
+{
+       return readl(hdcp->parser->io.dp_controller.base + offset);
+}
+
+static inline void dp_hdcp_write_hdcp(struct dp_hdcp *hdcp, u32 offset, u32 val)
+{
+       writel(val, hdcp->parser->io.hdcp_key.base + offset);
+}
+
+static inline u32 dp_hdcp_read_hdcp(struct dp_hdcp *hdcp, u32 offset)
+{
+       return readl(hdcp->parser->io.hdcp_key.base + offset);
+}
+
+static inline void dp_hdcp_write_tz(struct dp_hdcp *hdcp, u32 offset, u32 val)
+{
+       writel(val, hdcp->parser->io.hdcp_tz.base + offset);
+}
+
+static inline u32 dp_hdcp_read_tz(struct dp_hdcp *hdcp, u32 offset)
+{
+       return readl(hdcp->parser->io.hdcp_tz.base + offset);
+}
+
+int dp_hdcp_ingest_key(struct dp_hdcp *hdcp, const u8 *raw_key, int raw_len)
+{
+       struct dp_hdcp_key *key;
+       const u8 *ptr = raw_key;
Why have the local variable when raw_key will do?
+       unsigned int ksv_weight;
+       int i, ret = 0;
+
+       mutex_lock(&hdcp->key_lock);
This can move after the length check?
+
+       if (raw_len != (DRM_HDCP_KSV_LEN + DP_HDCP_NUM_KEYS * DP_HDCP_KEY_LEN)) {
+               DRM_ERROR("Invalid HDCP key length expected=%d actual=%d\n",
+                         (DRM_HDCP_KSV_LEN + DP_HDCP_NUM_KEYS * DP_HDCP_KEY_LEN),
+                         raw_len);
+               ret = -EINVAL;
+               goto out;
+       }
+
+       key = hdcp->key;
+
+       memcpy(key->ksv.bytes, ptr, DRM_HDCP_KSV_LEN);
+       ksv_weight = hweight32(key->ksv.words[0]) + hweight32(key->ksv.words[1]);
+       if (ksv_weight != 20) {
+               DRM_ERROR("Invalid ksv weight, expected=20 actual=%d\n",
+                         ksv_weight);
+               ret = -EINVAL;
+               goto out;
+       }
+
+       ptr += DRM_HDCP_KSV_LEN;
+       for (i = 0; i < DP_HDCP_NUM_KEYS; i++) {
+               memcpy(key->keys[i].bytes, ptr, DP_HDCP_KEY_LEN);
+               ptr += DP_HDCP_KEY_LEN;
+       }
+
+       DRM_DEBUG_DRIVER("Successfully ingested HDCP key\n");
+       hdcp->key->valid = true;
+
+out:
+       mutex_unlock(&hdcp->key_lock);
+       return ret;
+}
+
+static bool dp_hdcp_are_keys_valid(struct drm_connector *connector)
+{
+       struct dp_hdcp *hdcp = dp_display_connector_to_hdcp(connector);
+       u32 val;
+
+       val = dp_hdcp_read_dp(hdcp, DP_HDCP_STATUS);
+       return FIELD_GET(DP_HDCP_KEY_STATUS, val) == DP_HDCP_KEY_STATUS_VALID;
+}
+
+static int dp_hdcp_load_keys(struct drm_connector *connector)
+{
+       struct dp_hdcp *hdcp = dp_display_connector_to_hdcp(connector);
+       struct dp_hdcp_key *key;
+       int i, ret = 0;
+
+       mutex_lock(&hdcp->key_lock);
+
+       key = hdcp->key;
+
+       if (!key->valid) {
+               ret = -ENOENT;
+               goto out;
+       }
+
+       dp_hdcp_write_dp(hdcp, DP_HDCP_SW_LOWER_AKSV, key->ksv.words[0]);
+       dp_hdcp_write_dp(hdcp, DP_HDCP_SW_UPPER_AKSV, key->ksv.words[1]);
+
+       for (i = 0; i < DP_HDCP_NUM_KEYS; i++) {
+               dp_hdcp_write_hdcp(hdcp, DP_HDCP_KEY_LSB(i),
+                                  key->keys[i].words[0]);
+               dp_hdcp_write_hdcp(hdcp, DP_HDCP_KEY_MSB(i),
+                                  key->keys[i].words[1]);
+       }
+
+       dp_hdcp_write_hdcp(hdcp, DP_HDCP_KEY_VALID, DP_HDCP_SW_KEY_VALID);
+       wmb();
What are the wmb()s for? Can you add a comment indicating what we're
trying to fix by having them?
+
+       dp_hdcp_write_dp(hdcp, DP_HDCP_ENTROPY_CTRL0, get_random_u32());
+       dp_hdcp_write_dp(hdcp, DP_HDCP_ENTROPY_CTRL1, get_random_u32());
Can we call get_random_u64() at the start of this function outside the
mutex lock and then use the upper and lower halves for these two lines
above?
+       wmb();
+
+out:
+       mutex_unlock(&hdcp->key_lock);
+       return ret;
+}
+
+static int dp_hdcp_hdcp2_capable(struct drm_connector *connector, bool *capable)
+{
+       *capable = false;
+       return 0;
+}
+
+static int dp_hdcp_hdcp1_read_an_aksv(struct drm_connector *connector,
+                                     u32 *an, u32 *aksv)
+{
+       struct dp_hdcp *hdcp = dp_display_connector_to_hdcp(connector);
+       bool keys_valid;
+       int ret;
+       u32 val;
+
+       dp_hdcp_write_dp(hdcp, DP_HDCP_CTRL, 1);
+
+       ret = read_poll_timeout(dp_hdcp_are_keys_valid, keys_valid, keys_valid,
+                               20 * 1000, 10 * 1000, false, connector);
+       if (ret) {
+               drm_err(hdcp->dev, "HDCP keys invalid %d\n", ret);
+               return ret;
+       }
+
+       /* Clear AInfo */
+       dp_hdcp_write_dp(hdcp, DP_HDCP_RCVPORT_DATA4, 0);
+
+       aksv[0] = dp_hdcp_read_dp(hdcp, DP_HDCP_RCVPORT_DATA3);
+       aksv[1] = GENMASK(7, 0) & dp_hdcp_read_dp(hdcp, DP_HDCP_RCVPORT_DATA4);
+
+       ret = read_poll_timeout(dp_hdcp_read_dp, val,
+                               (val & DP_HDCP_AN_READY_MASK) == DP_HDCP_AN_READY_MASK,
+                               100, 10 * 1000, false, hdcp, DP_HDCP_STATUS);
+       if (ret) {
+               drm_err(hdcp->dev, "AN failed to become ready %x/%d\n", val, ret);
+               return ret;
+       }
+
+       /*
+        * Get An from hardware, for unknown reasons we need to read the reg
+        * twice to get valid data.
That's annoying.
+        */
+       dp_hdcp_read_dp(hdcp, DP_HDCP_RCVPORT_DATA5);
+       an[0] = dp_hdcp_read_dp(hdcp, DP_HDCP_RCVPORT_DATA5);
+
+       dp_hdcp_read_dp(hdcp, DP_HDCP_RCVPORT_DATA6);
+       an[1] = dp_hdcp_read_dp(hdcp, DP_HDCP_RCVPORT_DATA6);
+
+       return 0;
+}
+
+static int dp_hdcp_hdcp1_store_receiver_info(struct drm_connector *connector,
+                                            u32 *ksv, u32 status, u8 bcaps,
+                                            bool is_repeater)
+{
+       struct dp_hdcp *hdcp = dp_display_connector_to_hdcp(connector);
+       u32 val;
+
+       dp_hdcp_write_tz(hdcp, HDCP_SEC_DP_TZ_HV_HLOS_HDCP_RCVPORT_DATA0,
+                        ksv[0]);
+       dp_hdcp_write_tz(hdcp, HDCP_SEC_DP_TZ_HV_HLOS_HDCP_RCVPORT_DATA1,
+                        ksv[1]);
+
+       val = ((status & GENMASK(15, 0)) << 8) | (bcaps & GENMASK(7, 0));
Nitpick: Can this use FIELD_PREP() too?
+
+       dp_hdcp_write_tz(hdcp, HDCP_SEC_DP_TZ_HV_HLOS_HDCP_RCVPORT_DATA12, val);
+
+       return 0;
+}
+
+static int dp_hdcp_hdcp1_enable_encryption(struct drm_connector *connector)
+{
+       return 0;
+}
+
+static int dp_hdcp_hdcp1_wait_for_r0(struct drm_connector *connector)
+{
+       struct dp_hdcp *hdcp = dp_display_connector_to_hdcp(connector);
+       int ret;
+       u32 val;
+
+       ret = read_poll_timeout(dp_hdcp_read_dp, val, (val & DP_HDCP_R0_READY),
+                               100, 1000, false, hdcp,
+                               DP_HDCP_STATUS);
+       if (ret) {
+               drm_err(hdcp->dev, "HDCP R0 not ready %x/%d\n", val, ret);
+               return ret;
+       }
+
+       return 0;
+}
+
+static int dp_hdcp_hdcp1_match_ri(struct drm_connector *connector, u32 ri_prime)
+{
+       struct dp_hdcp *hdcp = dp_display_connector_to_hdcp(connector);
+       int ret;
+       u32 val;
+
+       dp_hdcp_write_dp(hdcp, DP_HDCP_RCVPORT_DATA2_0, ri_prime);
+
+       ret = read_poll_timeout(dp_hdcp_read_dp, val, (val & DP_HDCP_RI_MATCH),
+                               20 * 1000, 100 * 1000, false, hdcp,
Maybe 20 * 1000 and 100 * 1000 should be some defines at the top of this
file?
+                               DP_HDCP_STATUS);
+       if (ret) {
+               drm_err(hdcp->dev, "Failed to match Ri and Ri` (%08x) %08x/%d\n",
+                       ri_prime, val, ret);
+               return ret;
+       }
+       return 0;
+}
+
+static int dp_hdcp_hdcp1_store_ksv_fifo(struct drm_connector *connector,
+                                       u8 *ksv_fifo, u8 num_downstream,
+                                       u8 *bstatus, u32 *vprime)
+{
+       struct dp_hdcp *hdcp = dp_display_connector_to_hdcp(connector);
+       int num_bytes = (num_downstream * DRM_HDCP_KSV_LEN);
Nitpick: Why the parenthesis?
quoted hunk ↗ jump to hunk
+       int ret, i;
+       u32 val;
+
+       /* Reset the SHA computation block */
+       dp_hdcp_write_tz(hdcp, HDCP_SEC_DP_TZ_HV_HLOS_HDCP_SHA_CTRL,
+                        DP_HDCP_SHA_CTRL_RESET);
+       dp_hdcp_write_tz(hdcp, HDCP_SEC_DP_TZ_HV_HLOS_HDCP_SHA_CTRL, 0);
+
+       /*
+        * KSV info gets written a byte at a time in the same order it was
+        * received. Every 64 bytes, we need to wait for the SHA_BLOCK_DONE
+        * bit to be set in SHA_CTRL.
+        */
+       for (i = 0; i < num_bytes; i++) {
+               val = FIELD_PREP(DP_HDCP_SHA_DATA_MASK, ksv_fifo[i]);
+
+               if (i == (num_bytes - 1))
+                       val |= DP_HDCP_SHA_DATA_DONE;
+
+               dp_hdcp_write_tz(hdcp, HDCP_SEC_DP_TZ_HV_HLOS_HDCP_SHA_DATA,
+                                val);
+
+               if (((i + 1) % 64) != 0)
+                       continue;
+
+               ret = read_poll_timeout(dp_hdcp_read_dp, val,
+                                       (val & DP_HDCP_SHA_DONE), 100,
+                                       100 * 1000, false, hdcp,
+                                       DP_HDCP_SHA_STATUS);
+               if (ret) {
+                       drm_err(hdcp->dev, "SHA block incomplete %d\n", ret);
+                       return ret;
+               }
+       }
+
+       ret = read_poll_timeout(dp_hdcp_read_dp, val,
+                               (val & DP_HDCP_SHA_COMP_DONE), 100, 100 * 1000,
+                               false, hdcp, DP_HDCP_SHA_STATUS);
+       if (ret) {
+               drm_err(hdcp->dev, "SHA computation incomplete %d\n", ret);
+               return ret;
+       }
+
+       return 0;
+}
+
+static int dp_hdcp_hdcp1_disable(struct drm_connector *connector)
+{
+       struct dp_hdcp *hdcp = dp_display_connector_to_hdcp(connector);
+       u32 val;
+
+       val = dp_hdcp_read_dp(hdcp, REG_DP_SW_RESET);
+       dp_hdcp_write_dp(hdcp, REG_DP_SW_RESET, val | DP_HDCP_SW_RESET);
+
+       /* Disable encryption and disable the HDCP block */
+       dp_hdcp_write_dp(hdcp, DP_HDCP_CTRL, 0);
+
+       dp_hdcp_write_dp(hdcp, REG_DP_SW_RESET, val);
+
+       return 0;
+}
+
+void dp_hdcp_commit(struct dp_hdcp *hdcp, struct drm_atomic_state *state)
+{
+       drm_hdcp_helper_atomic_commit(hdcp->helper_data, state, NULL);
+}
+
+static const struct drm_hdcp_helper_funcs dp_hdcp_funcs = {
+       .are_keys_valid = dp_hdcp_are_keys_valid,
+       .load_keys = dp_hdcp_load_keys,
+       .hdcp2_capable = dp_hdcp_hdcp2_capable,
+       .hdcp1_read_an_aksv = dp_hdcp_hdcp1_read_an_aksv,
+       .hdcp1_store_receiver_info = dp_hdcp_hdcp1_store_receiver_info,
+       .hdcp1_enable_encryption = dp_hdcp_hdcp1_enable_encryption,
+       .hdcp1_wait_for_r0 = dp_hdcp_hdcp1_wait_for_r0,
+       .hdcp1_match_ri = dp_hdcp_hdcp1_match_ri,
+       .hdcp1_store_ksv_fifo = dp_hdcp_hdcp1_store_ksv_fifo,
+       .hdcp1_disable = dp_hdcp_hdcp1_disable,
+};
+
+int dp_hdcp_attach(struct dp_hdcp *hdcp, struct drm_connector *connector)
+{
+       struct drm_device *dev = connector->dev;
+       struct drm_hdcp_helper_data *helper_data;
+       int ret;
+
+       /* HDCP is not configured for this device */
+       if (!hdcp || !hdcp->parser || hdcp->parser->io.hdcp_key.len == 0)
+               return 0;
+
+       helper_data = drm_hdcp_helper_initialize_dp(connector, hdcp->aux,
+                                                   &dp_hdcp_funcs, false);
+       if (IS_ERR_OR_NULL(helper_data))
+               return PTR_ERR(helper_data);
+
+       ret = drm_connector_attach_content_protection_property(connector, false);
+       if (ret) {
+               drm_hdcp_helper_destroy(helper_data);
+               drm_err(dev, "Failed to attach content protection prop %d\n", ret);
+               return ret;
+       }
+
+       hdcp->dev = connector->dev;
+       hdcp->connector = connector;
+       hdcp->helper_data = helper_data;
+
+       return 0;
+}
+
+struct dp_hdcp *dp_hdcp_get(struct dp_parser *parser, struct drm_dp_aux *aux)
+{
+       struct dp_hdcp *hdcp;
+
+       hdcp = devm_kzalloc(&parser->pdev->dev, sizeof(*hdcp), GFP_KERNEL);
+       if (!hdcp)
+               return ERR_PTR(-ENOMEM);
+
+       hdcp->key = devm_kzalloc(&parser->pdev->dev, sizeof(*hdcp->key), GFP_KERNEL);
+       if (!hdcp->key)
+               return ERR_PTR(-ENOMEM);
+
+       hdcp->parser = parser;
+       hdcp->aux = aux;
+
+       mutex_init(&hdcp->key_lock);
+
+       return hdcp;
+}
+
+void dp_hdcp_put(struct dp_hdcp *hdcp)
+{
+       drm_hdcp_helper_destroy(hdcp->helper_data);
+}
diff --git a/drivers/gpu/drm/msm/dp/dp_hdcp.h b/drivers/gpu/drm/msm/dp/dp_hdcp.h
new file mode 100644
index 000000000000..5637a9b0dea2
--- /dev/null
+++ b/drivers/gpu/drm/msm/dp/dp_hdcp.h
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright (C) 2021 Google, Inc.
+ *
+ * Authors:
+ * Sean Paul <seanpaul@chromium.org>
+ */
+
+#ifndef DP_HDCP_H_
+#define DP_HDCP_H_
+
+#define DP_HDCP_KEY_LEN                                7
+#define DP_HDCP_NUM_KEYS                       40
+
+struct dp_hdcp;
+struct dp_parser;
+struct drm_atomic_state;
+struct drm_dp_aux;
+
+struct dp_hdcp *dp_hdcp_get(struct dp_parser *parser, struct drm_dp_aux *aux);
+void dp_hdcp_put(struct dp_hdcp *hdcp);
+
+int dp_hdcp_attach(struct dp_hdcp *hdcp, struct drm_connector *connector);
+int dp_hdcp_ingest_key(struct dp_hdcp *hdcp, const u8 *raw_key, int raw_len);
+void dp_hdcp_commit(struct dp_hdcp *hdcp, struct drm_atomic_state *state);
+
+#endif
diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
index 0519dd3ac3c3..75a163b0b5af 100644
--- a/drivers/gpu/drm/msm/dp/dp_parser.c
+++ b/drivers/gpu/drm/msm/dp/dp_parser.c
@@ -20,11 +20,11 @@ static const struct dp_regulator_cfg sdm845_dp_reg_cfg = {
 };

 static int msm_dss_ioremap(struct platform_device *pdev,
-                               struct dss_io_data *io_data)
+                               struct dss_io_data *io_data, int idx)
 {
        struct resource *res = NULL;

-       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       res = platform_get_resource(pdev, IORESOURCE_MEM, idx);
        if (!res) {
                DRM_ERROR("%pS->%s: msm_dss_get_res failed\n",
                        __builtin_return_address(0), __func__);
We should remove this error message. It's confusing now that some
resources are optional.
quoted hunk ↗ jump to hunk
@@ -55,6 +55,8 @@ static void dp_parser_unmap_io_resources(struct dp_parser *parser)
 {
        struct dp_io *io = &parser->io;

+       msm_dss_iounmap(&io->hdcp_tz);
+       msm_dss_iounmap(&io->hdcp_key);
        msm_dss_iounmap(&io->dp_controller);
 }
@@ -64,10 +66,20 @@ static int dp_parser_ctrl_res(struct dp_parser *parser)
        struct platform_device *pdev = parser->pdev;
        struct dp_io *io = &parser->io;

-       rc = msm_dss_ioremap(pdev, &io->dp_controller);
-       if (rc) {
-               DRM_ERROR("unable to remap dp io resources, rc=%d\n", rc);
+       rc = msm_dss_ioremap(pdev, &io->dp_controller, 0);
+       if (rc)
                goto err;
+
+       rc = msm_dss_ioremap(pdev, &io->hdcp_key, 1);
+       if (rc) {
+               io->hdcp_key.base = NULL;
+               io->hdcp_key.len = 0;
+       }
+
+       rc = msm_dss_ioremap(pdev, &io->hdcp_tz, 2);
+       if (rc) {
+               io->hdcp_tz.base = NULL;
+               io->hdcp_tz.len = 0;
Bjorn is trying to split the single io region apart into 4 different
regions[1]. This would add two more io regions. Maybe this should come
after those patches and be indexed later? I worry about needing to add
more register properties later on though. Maybe a better approach would
be to make them mandatory for certain compatible strings instead.

[1] https://lore.kernel.org/r/20210825222557.1499104-6-bjorn.andersson@linaro.org (local)
        }

        io->phy = devm_phy_get(&pdev->dev, "dp");
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